Era
20th century
174
19th century
94
1900-1999
70
1951-
47
21st century
42
1945-1989
36
1989-
35
1945-
32
1865-1950
28
1800-1899
26
Since 1945
25
18th century
22
Revolution, 1775-1783
19
1815-1861
18
2000-2099
18
Since 1900
16
1946-
15
1933-1945
13
1775-1783
12
1722-1803
11
1775-1865
11
1837-1901
11
1991-
11
Civil War, 1861-1865
11
Since 1951
10
1767-1845
9
1809-1865
9
1980-
9
Colonial period, ca. 1600-1775
9
1811-1872
8
1849-1877
8
1900-2099
8
1979-1997
8
1760-1789
7
1763-1835
7
17th century
7
1845-1861
7
1861-1865
7
1936-1953
7
To 1775
7
1725-1797
6
1789-1820
6
1815-1882
6
1888-1969
6
1928-1999
6
1944-
6
1985-1991
6
2001-2009
6
16th century
5
1841-1867
5
more ...